more fix

Author: Kha

Mathlib/FieldTheory/IntermediateField/Adjoin/Defs.lean

@@ -521,7 +521,7 @@ scoped macro:max K:term "⟮" xs:term,* "⟯" : term => do ``(adjoin $K $(← mk
 
 open Lean PrettyPrinter.Delaborator SubExpr in
 @[app_delab IntermediateField.adjoin]
-meta def delabAdjoinNotation : Delab := whenPPOption getPPNotation do
+meta partial def delabAdjoinNotation : Delab := whenPPOption getPPNotation do
   let e ← getExpr
   guard <| e.isAppOfArity ``adjoin 6
   let F ← withNaryArg 0 delab